/Engine/Source/Editor/BlueprintGraph/Classes/K2Node.h
Handles inserting the node between the FromPin and what the FromPin was original connected to
void InsertNewNode ( [UEdGraphPin](API\Runtime\Engine\EdGraph\UEdGraphPin) * FromPin, [UEdGraphPin](API\Runtime\Engine\EdGraph\UEdGraphPin) * NewLinkPin, [TSet](API\Runtime\Core\Containers\TSet)< [UEdGraphNode](API\Runtime\Engine\EdGraph\UEdGraphNode) * > & OutNodeList )